[GEM-dev] pix_chroma_key not acting as I expect?

IOhannes m zmölnig zmoelnig at iem.at
Wed Apr 26 08:42:16 CEST 2006


Mathieu Bouchard wrote:
> On Tue, 25 Apr 2006, chris clepper wrote:
> 
> 
>>On 4/25/06, B. Bogart <ben at ekran.org> wrote:
>>
>>> I still could not get pix_chroma_key to key on "value 16,16,16" remember
>>>our green is 0,240,0 not 0,255,0. (which I guess is YUV 0,0,0)? what
>>>should the YUV range be like for this video?
>>
>>I may have bungled some of the code in that object.  Try 128, 50, 50
>>and a range of 30 or so for a green background.  I was able to key out
>>a fairly typical green screen with that.
> 
> 
> there's [rgb2hsv], [hsv2rgb], but do [rgb2yuv] and [yuv2rgb] exist yet?

yes, i submitted them yesterday evening to the abstractions/ folder.

to make them compatible with [hsv2rgb], the values are normalized to 
0..1; shouldn't we adapt this to the values [pix_chroma_key] takes too?

mfg.adsr
IOhannes




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